Well Above Normal Shower and Thunder Chances. Large uncertainty with the wind forecast. Deep moisture and an approaching weak frontal boundary will result in 60 - 80% chance for showers with a chance for thunderstorms for the remainder of the week. Highest likelihood for heavy rainfall and thunderstorms over the Keys tonight and Thursday. Considerable uncertainty regarding northeast to easterly wind speeds over the next few days.
May 2026 heat enters the record books for Key West, ranking as the warmest May (ties 2024) and the warmest Spring (previously 2024) on record.
May averaged 84.7°F (3.6 degrees above the 30-yr average/normal)
Spring [March-April-May] averaged 80.5°F (2.7 degrees above the 30-yr average/normal)
Temperature records date back to July 1872 for Key West and June 1950 for Marathon (however, Marathon did not rank in the top 10 for warmest May or Spring.)
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